Bun

# Create new project
bun init

# Run files directly
bun run index.ts
bun run index.js

# Run scripts from package.json
bun run dev
bun run build

# Install dependencies
bun install
bun add <package>
bun add -d <package>  # Dev dependency
bun remove <package>

// File I/O
const file = Bun.file("data.json");
const text = await file.text();
const json = await file.json();
await Bun.write("output.txt", "Hello!");

// HTTP Server
Bun.serve({
  port: 3000,
  fetch(req) {
    const url = new URL(req.url);
    if (url.pathname === "/api") {
      return Response.json({ status: "ok" });
    }
    return new Response("Hello World!");
  },
});

// Password hashing
const hash = await Bun.password.hash("secret");
const valid = await Bun.password.verify("secret", hash);

import { test, expect, describe } from "bun:test";

describe("math", () => {
  test("addition", () => {
    expect(2 + 2).toBe(4);
  });

  test("async operation", async () => {
    const result = await fetchData();
    expect(result).toBeDefined();
    expect(result.status).toBe("ok");
  });
});

// Run tests
// bun test
// bun test --watch